The Daily's Ben Estes reported today that Derek Dennis has been injured since Tuesday of the Notre Dame series. The nature of the injury remains undisclosed, but it is a day-to-day issue and he is expected back in time for the Ohio State series this upcoming weekend.
Baseball: Dennis Injury Update
Probably a minor sprain of some sort, if it's that short of a waiting period.
Baseball certainly has the Fort Schembechler mentality. I have a DM tweet from M Baseball saying, "Just giving him a day off" from the ND game.